Need Help This Is A Tricky One

Find the volume of the described solid.the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x.a) 441b) 147c) 864d) 882

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

What is the value of x? enter your answer in the box.